and DDP piling (1,157 total) installed by Cajun. All of this resulted
in an increase of more than 700 percent of the original contract
value for Cajun.
In addition, once the underground piping operations began,
it became apparent that the soils were not conducive for open
cut excavation installation. Cajun became involved and began
installation of temporary sheet pile shoring to accommodate the
piping and culvert installations. Cajun worked with the Owner to
purchase nearly 113,000 square feet of PZC18 sheet piling. Cajun
implemented design and installation of temporary and permanent
shoring in excess of 58 separate sumps and trenches utilizing
these piling. These sheets were installed and extracted numerous
times in a leapfrog fashion to accommodate the underground
installations, resulting in a total installed quantity of 2.4 million
square feet.
As much of this work was being performed simultaneously, as
many as 27 different cranes were utilized at one time to accomplish
the installations in a timely manner. This required many
crane moves and coordination with multiple contractors. Cajun
worked closely with all parties to accomplish these moves with
minimal impact to either the Owner, other contractors, the public
or construction schedule. Weekly meetings were held between
Cajun, FTI and the Owner to discuss crane schedules and moves,
and how they coordinated with design drawing releases and work
area preparations.
Cajun utilized many different hammers to accomplish this
work. For the pre-cast piling, diesel impact hammers were utilized,
including: ICE I30; APE D30; and APE D36. For the sheet pile installations,
vibratory hammers were utilized including: ICE 44B; APE
200; APE 200-6; and APE King Kong at Pond 6. In order to complete
sheet pile installation to grade at Pond 6, a BSP hydraulic impact
hammer was also used. Spare hammers were kept and maintained
onsite by a full-time Cajun mechanic to minimize downtime from
equipment breakdowns.
Dilution basin shoring
The work at this project continued for Cajun until May 2018.
During the course of the project, Cajun successfully performed
this work with no serious incidents or recordable injuries. This
was accomplished with a workforce of more than 300 employees
at peak, many of whom were new to the piling trade and required
on-the-job training. Also, during this nearly four-year period, many
new and long-term employees were recognized for their performance
and abilities and promoted to higher levels of responsibility
within Cajun. t
PROJECT SPOTLIGHT
As many as 27 different cranes
were utilized at one time to
accomplish the installations
in a timely manner.
An overview of the project site
94 | EDITION 6 2019 www.piledrivers.org
/www.piledrivers.org
